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Image processing apparatus, imaging apparatus, and image processing method

a technology of image processing and imaging apparatus, applied in image enhancement, image analysis, color signal processing circuits, etc., can solve the problems of insufficient inability to obtain stable results, and inability to change the brightness of the image of histogram smoothing, etc., to achieve the effect of stably changing the result of histogram smoothing

Active Publication Date: 2018-02-13
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution provides stable histogram smoothing results by maintaining consistent distribution across gradations, reducing the impact of exposure changes and ensuring consistent image brightness.

Problems solved by technology

However, it is insufficient to stably change the result of the histogram smoothing, and brightness of the image of the histogram smoothing can change depending on conditions.
That is, in the gradation conversion processing illustrated in Patent Literature 1, a stable result cannot be obtained when local gradation conversion processing using the histogram smoothing is executed.

Method used

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  • Image processing apparatus, imaging apparatus, and image processing method
  • Image processing apparatus, imaging apparatus, and image processing method
  • Image processing apparatus, imaging apparatus, and image processing method

Examples

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Embodiment Construction

[0038]An example in which the present invention is applied to a digital camera as an embodiment will be described below. This digital camera has an imaging section and uses this imaging section to image a subject field and converts it to image data and performs live-view display of the subject image on a display section arranged on a rear surface of a body on the basis of this converted image data. A photographer observes the live-view display and determines a composition and a shutter chance. In a releasing operation, the image data is recorded in a recording medium. The image data recorded in the recording medium can be reproduced / displayed on the display section by selecting a reproduction mode.

[0039]FIG. 1 is a block diagram illustrating mainly electrical configuration of the camera according to the embodiment of the present invention. This camera is constituted by a camera body 100 and an interchangeable lens 200 that can be detachably attached thereto.

[0040]The interchangeable...

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PUM

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Abstract

An image processing apparatus according to the present invention comprises a histogram generating section for generating a histogram by counting a frequency value for each gradation of a predetermined number of gradations as brightness distribution of input image data, a distribution processing section for distributing a count value of the histogram to adjacent gradations, a cumulative histogram generating section for generating a cumulative histogram by accumulating the histograms obtained by the histogram generating section from a low gradation side, and a gradation correction processing section for performing contrast correction by using the cumulative histogram, wherein the distribution processing section fixes a distribution amount to the predetermined number of gradations when distributing the count value to the adjacent gradations.

Description

[0001]Benefit is claimed, under 35 U.S.C. §119, to the filing date of prior Japanese Patent Application No. 2015-000814 filed on Jan. 6, 2015. This application is expressly incorporated herein by reference. The scope of the present invention is not limited to any requirements of the specific embodiments described in the application.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an image processing apparatus, an imaging apparatus, and an image processing method for generating a cumulative histogram from a histogram of an image and executing gradation conversion processing for performing histogram smoothing.[0004]2. Description of the Related Art[0005]Conventionally, gradation conversion processing in which a cumulative histogram is generated from a histogram of an image and histogram smoothing is executed is known. When the gradation conversion processing is to be executed in an imaging apparatus such as a camera, a histogram is gener...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06T5/40G06T5/00H04N1/60H04N9/68H04N23/76
CPCG06T5/40G06T5/009H04N9/68H04N1/6027G06T2207/20208H04N1/4074H04N5/20H04N23/88H04N23/84G06T5/92
Inventor KINO, TATSUYA
Owner OLYMPUS CORP